Clinton, the former U.S. secretary of state, has led Trump, a New York businessman, throughout most of the 2016 campaign. But her latest lead represents a stronger level of support than polls indicated over the past few weeks. Earlier in August, Clinton's lead over Trump ranged from 3 to 9 percentage points in the poll.

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Hillary Clinton and Tim Kaine on the trail since the DNC

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Hillary Clinton and Tim Kaine on the trail since the DNC

NEW YORK, NY- Democratic Nominee for President of the United States former Secretary of State Hillary Clinton speaks to journalists after meeting national security experts for a National Security Working Session at the New York Historical Society Library in Manhattan, New York on Friday September 9, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

NEW YORK, NY - SEPTEMBER 09: Democratic presidential nominee former Secretary of State Hillary Clinton (L) greets actress Laverne Cox during he LGBT for Hillary Gala at Cipriani Club on September 9, 2016 in New York City. Hillary Clinton is attending fundraisers and in New York City. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - Democratic Nominee for President of the United States former Secretary of State Hillary Clinton speaks to the Press Corp on the airport tarmac in front of her campaign plane before flying off on a day of campaigning in White Plains, New York on Thursday September 8, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

New York, NY - Democratic Nominee for President of the United States former Secretary of State Hillary Clinton participates in a NBC/MSNBC/Iraq and Afghanistan Veterans of America Commander in Chief Forum in midtown Manhattan in New York, New York on Wednesday September 7, 2016. Hosted by Today show co-anchor Matt Lauer. (Photo by Melina Mara/The Washington Post via Getty Images)

TAMPA, FL - SEPTEMBER 06: Democratic presidential nominee former Secretary of State Hillary Clinton has her picture taken with a supporter during a voter registration rally at the University of South Florida on September 6, 2016 in Tampa, Florida. Hillary Clinton is campaigning in Florida. (Photo by Justin Sullivan/Getty Images)

CLEVELAND, OH - SEPTEMBER 05: Democratic presidential nominee former Secretary of State Hillary Clinton speaks during a campaign rally at Luke Easter Park on September 5, 2016 in Cleveland, Ohio. Clinton is on a Labor Day campaign swing to Ohio and Iowa on a new campaign plane large enough to accommodate her traveling press corp. (Photo by Justin Sullivan/Getty Images)

CLEVELAND, OH - SEPTEMBER 05: Democratic presidential nominee former Secretary of State Hillary Clinton greets a supporter during a campaign rally at Luke Easter Park on September 5, 2016 in Cleveland, Ohio. Clinton is kicking off a Labor Day campaign swing to Ohio and Iowa on a new campaign plane large enough to accommodate her traveling press corp. (Photo by Justin Sullivan/Getty Images)

Hillary Clinton, 2016 Democratic presidential nominee, speaks at a campaign event during The American Legion National Convention at the Duke Energy Convention Center in Cincinnati, Ohio, U.S., on Wednesday, Aug. 31, 2016. Clinton told a veterans group that U.S. leadership is vital to the world and, drawing a contrast with Republican Donald Trump, said that means the White House is no place for a leader who insults allies or threatens to shrink from that role. Photographer: Ty Wright/Bloomberg via Getty Images

UNITED STATES - AUGUST 30: Democratic nominee for Vice President Sen. Tim Kaine, D-Va., holds a campaign rally at the Boys & Girls Club in Lancaster, Pa., on Tuesday, Aug. 30, 2016. (Photo By Bill Clark/CQ Roll Call)

JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EDT and features a diverse lineup of guests that includes celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Monday, August 22 included Presidential Nominee and former United States Secretary of State Hillary Clinton and John Krasinski ('The Hollars'). (Photo by Randy Holmes/ABC via Getty Images)
HILLARY CLINTON, JIMMY KIMMEL

MANHATTAN, NY - AUGUST 18: U.S. Presidential candidate Hillary Clinton meets with law enforcement experts at the John Jay College of Criminal Justice in Manhattan, NY, on August 18, 2016. (Photo by Yana Paskova/For The Washington Post via Getty Images)

CLEVELAND, OH - AUGUST 17: Democratic candidate for President Hillary Clinton speaks to supporters during a Hillary for America rally at John Marshall High School on August 17, 2016 in Cleveland, Ohio. (Photo by Jeff Swensen/Getty Images)

CLEVELAND, OH-August 17: Democratic presidential candidate Hillary Clinton tours John Marshall High School
August 17, 2016 in Cleveland, Ohio. Clinton was scheduled to speak at a rally at the school. (Photo by Jeff Swensen/Getty Images)

DETROIT, MI - Democratic Nominee for President of the United States former Secretary of State Hillary Clinton tours Futuramic Tool & Engineering, before delivering an economic speech and job creation, in Detroit, Michigan on Thursday August 11, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

KISSIMMEE, FL - AUGUST 08: Democratic presidential nominee Hillary Clinton stands with Sen. Bill Nelson (D-FL) as she attends a campaign rally at the Exhibition Hall in Kissimmee, Florida on August 8, 2016. Clinton continues to campaign to become the President of the United States. (Photo by Joe Raedle/Getty Images)

LAS VEGAS, NV - Democratic Nominee for President of the United States former Secretary of State Hillary Clinton tours a small business, Mojave Electric, in Las Vegas, Nevada on Thursday August 4, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

RICHMOND, VA - AUGUST 01: Democratic vice presidential candidate Sen. Tim Kaine (D-VA) poses for photos with supporters during a campaign event August 1, 2016 in Richmond, Virginia. Kaine returns to campaign in a homecoming rally after he was picked to be the running mate of Hillary Clinton. (Photo by Alex Wong/Getty Images)

CLEVELAND, OH - On the third day of a bus tour through Pennsylvania and Ohio, Democratic Nominee for President of the United States former Secretary of State Hillary Clinton along with running mate Senator Tim Kaine, and Anne Holton, aboard the campaign bus in Cleveland, Ohio on Sunday July 31, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

PITTSBURGH, PA - On the second day of a bus tour through Pennsylvania and Ohio, Democratic Nominee for President of the United States former Secretary of State Hillary Clinton along with running mate Senator Tim Kaine, Anne Holton, and President Bill Clinton, speak to and meet Pennsylvania voters during a rally in Pittsburgh, Pennsylvania on Saturday, July 30, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)

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The poll also found that about 22 percent of likely voters would not pick either candidate. That lack of support is high compared with how people responded to the poll during the 2012 presidential election between Democratic President Barack Obama and Republican Mitt Romney.

"Those who are wavering right now are just as likely to be thinking about supporting a third-party candidate instead, and not between Clinton and Trump," said Tom Smith, who directs the Center for the Study of Politics and Society at the University of Chicago.

During the latest polling, Clinton faced renewed scrutiny about her handling of classified emails while serving as secretary of state from 2009 to 2013, and Trump's campaign chief, Paul Manafort, resigned after a reshuffle of the candidate's campaign leadership team.

Clinton held a smaller lead in a separate four-way poll that included Libertarian nominee Gary Johnson and Jill Stein of the Green Party. Among likely voters, 41 percent supported Clinton, while 33 percent backed Trump. Johnson was backed by 7 percent and Stein by 2 percent.

The Reuters/Ipsos poll was conducted online in English in all 50 states. Both presidential polls included 1,115 respondents and had a credibility interval, a measure of accuracy, of 3 percentage points.